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A facile synthesis of a cobalt nanoparticle–graphene nanocomposite with high-performance and triple-band electromagnetic wave absorption properties

机译：具有高性能和三频电磁波吸收特性的钴纳米颗粒-石墨烯纳米复合材料的简便合成

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Ferromagnetic metal nanoparticle/graphene nanocomposites are promising as excellent electromagnetic (EM) wave absorption materials. In this work, we used a facile method to synthesize a cobalt nanoparticle–graphene (CoNP–G) nanocomposite. The obtained CoNPs–G exhibited a saturation magnetization (Ms) of 31.3 emu g?1 and a coercivity (HC) of 408.9 Oe at 298.15 K. In particular, the CoNPs–G nanocomposite provided high-performance EM wave absorption with multiband, wide effective absorption bandwidth, which was mainly attributed to the synergy effects generated by the magnetic loss of cobalt and the dielectric loss of graphene. In the range of 2–18 GHz, the sample (55 wt% CoNPs–G) held three effective reflection loss (RL) peaks (frequency ranges of 2.4–3.84, 7.84–11.87 and 13.25–18 GHz, respectively, RL ≤ ?10 dB) with the coating thickness of 4.5 mm, and the effective bandwidth reached the maximum of 10.22 GHz, and the minimal RL reached ?40.53 dB at 9.50 GHz. Therefore, the CoNPs–G nanocomposite presents a great promising application in the electromagnetic wave absorption field.
机译：铁磁金属纳米颗粒/石墨烯纳米复合材料有望作为优良的电磁（EM）吸波材料。在这项工作中，我们使用了一种简便的方法来合成钴纳米颗粒-石墨烯（CoNP-G）纳米复合材料。所得CoNPs-G的饱和磁化强度（ M s ）为31.3 emu g ？1 和298.15 K时矫顽力（ H C ）。特别是，CoNPs–G纳米复合材料提供了具有多频带的高性能电磁波吸收，有效吸收带宽较宽，这主要归因于钴的磁损耗和石墨烯的介电损耗所产生的协同效应。在2–18 GHz范围内，样品（55 wt％CoNPs–G）具有三个有效反射损耗（RL）峰（频率范围分别为2.4–3.84、7.84–11.87和13.25–18 GHz，RL≤？ 10 dB），涂层厚度为4.5 mm，有效带宽达到最大10.22 GHz，最小RL在9.50 GHz时达到40.53 dB。因此，CoNPs-G纳米复合材料在电磁波吸收领域具有广阔的应用前景。

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